參數(shù)資料
型號(hào)： VEM57T5-32.768K-1.0/-20+70
廠商： EUROQUARTZ LTD
元件分類： TCVCXO, clock
英文描述： TCVCXO, CLOCK, 0.032768 MHz, HCMOS OUTPUT
封裝： ROHS COMPLIANT, MINIATURE, SMD, 4 PIN
文件頁數(shù)： 1/1頁
文件大?。?/td> 240K
代理商： VEM57T5-32.768K-1.0/-20+70
EURO QUARTZ
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001
info@euroquartz.co.uk
www.euroquartz.co.uk
TCXO
DESCRIPTION
VEM57T 32.768kHz TCXOs provide tight control of the 32.768kHz
real time clock frequency in a small, industry-standard package. The
TCXOs are packaged in 7x5mm SMD format. With HCMOS output,
close tolerances are available from ±1.0ppm over -10° to +60°C.
Miniature SMD package 7 x 5 x 2.5mm
Real-time clock frequency: 32.768kHz
Stability from ±1.0ppm over -30° to +75°C
±1.5ppm over -40 to +85°C available
Supply voltage 2.8 Volts to 5.0 Volts
0.01uF decoupling capacitor built-in
SPECIFICATION
Product:
VEM57T-32.768
Frequency:
32.768kHz
Output Waveform:
Square wave HCMOS
Initial Calibration Tolerance*:
±3ppm at 25°C
VCON = +1.5VDC
Operating Temperature Range:
See table
Frequency Stability
vs. Ageing:
±1.0 ppm max. first year
vs. Voltage Change:
±0.3 ppm max. ±5% change
vs. Load Change:
±0.3 ppm max. ±10% change
vs. Reflow:
±1ppm max. for one reflow
(Measured after 24 hours)
Supply Voltage:
+2.8 VDC (Code ‘28’)
+3.0 VDC (Code ‘3’)
+3.3 VDC (Code ‘33’)
+5.0 VDC (Code ‘5’)
Output Voltage Level (Vdd = 3.0V)
Logic ‘1’ HIGH:
2.7V minimum
Logic ‘0’ LOW:
10% Vdd maximum
Rise & Fall Times:
3ns typical (20~80% Vdd)
Duty Cycle (Symmetry):
50%±10% (at 50%Vdd)
Start-up Time:
2ms typical
Current Consumption:
3.5mA typical at Vdd = 3.3V
7.0mA typical at Vdd = 5.0V
Electronic Frequency Tuning (EFC)
±5 to ±12ppm, Vcon = 1.5V
All supply voltage variants
have Vcon = 1.5 ±1VDC
Slope Polarity:
Positive (increase of Vcon
increases output frequency)
Output Load:
15pF
SSB Phase Noise:
See table
Output Format:
AC block, DC coupled
Storage Temperature:
-50° to +100°C
VEM57T-32.768 - OUTLINES AND DIMENSIONS
Frequency Stability (ppm)
±1.0
±1.5
±2.0
±2.5
Temperature
Range (°C)
0 ~ +50
-10 ~ +60
-20 ~ +70
-30 ~ +75
-40 ~ +85
x
= available
x = not available
FREQUENCY STABILITY
VEM57T-32.768 - TEST CIRCUIT
SSB Phase
Noise
at 25°C
Offset
(Hz)
10
100
1k
10k
100k
EM57T
32.768kHz
(dBc/Hz)
-65
-100
-130
-150
VEM57T-32.768 - PART NUMBERING PROCEDURE
Example:
VEM57T3-32.768k-2.5/-30+75
Series Description
Supply Voltage
28 = 2.8 VDC
3 = 3.0 VDC
33 = 3.3 VDC
5 = 5.0 VDC
Frequency
Stability over OTR (±ppm)
Operating Temperature Range (OTR) (°C)
* Stability over temperature will be from this measured initial frequency
PHASE NOISE
Voltage-controlled HCMOS 7 x 5 x 2.5mm SMD
VEM57T 32.768kHz
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